/*! * assertion-error * Copyright(c) 2013 Jake Luer <jake@qualiancy.com> * MIT Licensed */ /*! * Return a function that will copy properties from * one object to another excluding any originally * listed. Returned function will create a new `{}`. * * @param {String} excluded properties ... * @return {Function} */ function exclude () { var excludes = [].slice.call(arguments); function excludeProps (res, obj) { Object.keys(obj).forEach(function (key) { if (!~excludes.indexOf(key)) res[key] = obj[key]; }); } return function extendExclude () { var args = [].slice.call(arguments) , i = 0 , res = {}; for (; i < args.length; i++) { excludeProps(res, args[i]); } return res; }; }; /*! * Primary Exports */ module.exports = AssertionError; /** * ### AssertionError * * An extension of the JavaScript `Error` constructor for * assertion and validation scenarios. * * @param {String} message * @param {Object} properties to include (optional) * @param {callee} start stack function (optional) */ function AssertionError (message, _props, ssf) { var extend = exclude('name', 'message', 'stack', 'constructor', 'toJSON') , props = extend(_props || {}); // default values this.message = message || 'Unspecified AssertionError'; this.showDiff = false; // copy from properties for (var key in props) { this[key] = props[key]; } // capture stack trace ssf = ssf || AssertionError; if (Error.captureStackTrace) { Error.captureStackTrace(this, ssf); } else { try { throw new Error(); } catch(e) { this.stack = e.stack; } } } /*! * Inherit from Error.prototype */ AssertionError.prototype = Object.create(Error.prototype); /*! * Statically set name */ AssertionError.prototype.name = 'AssertionError'; /*! * Ensure correct constructor */ AssertionError.prototype.constructor = AssertionError; /** * Allow errors to be converted to JSON for static transfer. * * @param {Boolean} include stack (default: `true`) * @return {Object} object that can be `JSON.stringify` */ AssertionError.prototype.toJSON = function (stack) { var extend = exclude('constructor', 'toJSON', 'stack') , props = extend({ name: this.name }, this); // include stack if exists and not turned off if (false !== stack && this.stack) { props.stack = this.stack; } return props; };